20868889919 has 8 divisors (see below), whose sum is σ = 21053131488. Its totient is φ = 20685254400.

The previous prime is 20868889841. The next prime is 20868889931. The reversal of 20868889919 is 91998886802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20868889919 - 2²⁴ = 20852112703 is a prime.

It is a super-2 number, since 2×20868889919² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20868889939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82202 + ... + 220215.

It is an arithmetic number, because the mean of its divisors is an integer number (2631641436).

Almost surely, 2^20868889919 is an apocalyptic number.

20868889919 is a deficient number, since it is larger than the sum of its proper divisors (184241569).

20868889919 is a wasteful number, since it uses less digits than its factorization.

20868889919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303025.

The product of its (nonzero) digits is 35831808, while the sum is 68.

The spelling of 20868889919 in words is "twenty billion, eight hundred sixty-eight million, eight hundred eighty-nine thousand, nine hundred nineteen".